Which polynomial is prime?

With #! i’ve tried to figure it out but i can’t.

Given f(t) = 282 - 53 +1, determine the function value f(2). do not include f(z) = in your answer

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?